Synthesis of Intermediate 2,3-Dichloro-1,4-naphthoenone for Fungicide Dithianon

摘要

The synthetic method of dithianon intermediate 2,3-dichloro-1,4-naphthoquinone was introduced.Starting with raw material sodium 4-amino1-naphthalene sulfonate,2,3-dichloro-1,4-naphthoquinone was synthesized through acidification,chlorination and oxidation.After filtration and recrystallization,more than 98%of 2,3-dichloro-1,4-naphthoquinone was obtained,and the yield reached 76%(measured by sodium 4-amino-1-naphthalene sulfonate).